The monadfibre package

This package defines a Monad Transformer called Fibre,
which provides the underlying monad with Choice and Parallelism.
Also included is a Class called MonadBi which acts as a superset
of MonadTrans, and provides raise analogous to lift as well
as lower, which goes the other way.
Natural instances are provided for many Monad Transformers.

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Readme for monadfibre

Readme for monadfibre-0.1

Monad Fibre (monadfibre-0.1)
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This package defines a Monad Transformer called Fibre, which provides the underlying monad with Choice and Parallelism.
Also included is a Class called @MonadBi@ which acts as a superset of MonadTrans, and provides raise analogous to lift as well as lower, which goes the other way.
Natural instances are provided for many Monad Transformers.